Give and Take: New "vehicle to grid" (V2G) technology was presented at the annual meeting of the American Association for the Advancement of Science. V2G could use plug-in hybrid electric cars to help store excess power from wind and solar suppliers. Scientific American

The Vegetarian's Dilemma: A recent study found that a vegetarian diet of imported, processed meat substitutes is more harmful to the environment than a diet that includes locally raised beef. Telegraph and Green LA Girl

Ants Marching: Scientists using cell phone data to trace people's movements found that individuals' locations can be predicted about 93 percent of the time. The study could help urban planners create more efficient transportation and energy grids. New Scientist

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